Three resistors are connected in series across a 16-V power supply. If the potential drops across resistors 1 and 2 are 4.9 volts and 2.9 volts, what is the exact potential drop (in volts) across resistor 3?

a. A 216-O and a 212-O resistor are connected in series across an unspecified power supply. If the current through the 216-O resistor is 0.95 A, what is the exact current (in A) through the 212-O resistor?
b. A battery supplies 0.71 A to three resistors connected in parallel. The current through the first resistor is 0.27 A and the current through the second resistor is 0.24 A. What is the exact current (in A) through the third resistor?
c. A 134 O resistor and a 131 O resistor are both connected in parallel across a power supply. If the potential drop across the 134 O resistor is 18 V, what is the exact potential drop (in V) across the 131 O resistor?
d. There is 79 V across a 21-O resistor. What is the power dissipated by the resistor (in W)?